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Chrysler Repair/2004 Stratus 2.4 backfire

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Question
Hi

Lately I have some problems with my 2004 Dodge Stratus 2.4 DOHC.

It Backfires into intake mainfold.
Especially on acceleration, when car is on Park, also pushing accelerator pedal rapidly it  making laud backfire.
It happens on cold and hot engine.

What should I check before to start replacing good parts?

What I know about vehicle:
No stored codes
TPS in correct (cheked and confirmed)
O2 sensor is moving very slow (checked and confirmed with pro)
exhaust is leaking in middle and at the end after O2 sensor.

Lately I've changes spark plugs to Autolite Platinum.
Fuel economy 8.0 highway to mixed 11,0.

Thanks in advance
Chris

Answer
Hi Chris,
Absent fault codes I would start by correcting the exhaust leaks as that can cause O2 reading errors which then causes incorrect injector pulse width and loss of fuel economy. and also may be the source of the backfire gas.
Then keep checking for fault codes.
If the upstream sensor doesn't set a code but does show slow movement you might help this out by replacing the sensor. I would be reluctant to change anything beyond that until making those corrections.
Please see the PS below and respond.
Thanks,
Roland  

Chrysler Repair

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Roland Finston

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Get a Free Fast answer to your repair question about a Chrysler/Dodge/Plymouth car, minivan, SUV, or truck. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty. This free troubleshoot advice forum helps you diagnose faults, minimize repair costs or do-it-yourself.

I answer questions seven days a week and respond to you in about 30 minutes. "Maxed Out" means I am answering another question, briefly unavailable, or asleep overnight, so try again later.

I have do-it-yourself experience (50+ years) and a library of 100 1982-2012 Chrysler factory shop manuals and 20 multi-manual Chrysler Corp. CD's.

I was voted "Top Expert" 2010-2015, here at AllExperts, and have answered 20,000+ questions.

Experience

Five decades as a 'do-it-yourselfer' on domestic and imported cars.

Organizations
Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

Education/Credentials
Advanced degrees in Physics/bruised knuckles

Awards and Honors
"Top expert" of 2010, 2011, 2012, 2013, 2014 and 2015 here at Allexperts. Quickest "average response time" at Allexperts (currently no. 1).

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